Split rocker boxes
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Cruiser
Joined: Jun 2014
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From: Upstate NY
Split rocker boxes
I am in the process of replacing the rocker boxes on my custom 78 shovelhead. It currently has OEM rocker boxes that were split and powder coated - we noticed a hairline crack on the inside, and it looks like the chrome was never removed so I plan in looking for a used pair of OEM's to split and powder coat again. Of course the rear rocker had a slight leak.
My question is - if this is done properly, will there still be a chance they leak? There is that 9th middle bolt that can't be used when the boxes are split... but I found a pair of NEW split rockers online for about $600 that still use that bolt in the center, but still gives that split look.
I hope I'm explaining myself clearly.
Any advice would be helpful. Thanks!
My question is - if this is done properly, will there still be a chance they leak? There is that 9th middle bolt that can't be used when the boxes are split... but I found a pair of NEW split rockers online for about $600 that still use that bolt in the center, but still gives that split look.
I hope I'm explaining myself clearly.
Any advice would be helpful. Thanks!
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
lots of missing info
the rear box is cracked - well what did that --
valve spring pressure plays into this -- OH it has evo rocker conversion - i am running paper gaskets with no 9 th bolt - - not a fan but we have done them with no way no how we do it over if it leaks - had them on my sporty back in the day for a while -
tin gaskets are the only deal and you have to glue them with the ( right stuff ) permatex # 85224 - i dont care what the tin gasket company sayes you need to glue them
the trick is to use a double sheet of paper towel and take the right stuff smear on to the gloves between the fingers a wad of glue - than work it into the tin gasket both sides all around - then take it the glued gasket and put it into the paper towel and fold over - change the gloves to new set they are gone - than pat the paper towel as it was folded over the glued gasket after a min or 2 - take a look - if its still thick and oozing - new paper towel and do over pat it for a min or 2 than look again if it looks like a cometic foam gasket its ready to install -
the only way we found to keep them from coming back a week later
coating the covers makes them worp BTW and we re dress the gasket area after its all coated, than we bolt the rockers in as well ( before machining ) then take it all apart to clean before its ready to install - bolting it as its going to be insatlled moves the covers a bit as well -- reason we do it that way
the rear box is cracked - well what did that --
valve spring pressure plays into this -- OH it has evo rocker conversion - i am running paper gaskets with no 9 th bolt - - not a fan but we have done them with no way no how we do it over if it leaks - had them on my sporty back in the day for a while -
tin gaskets are the only deal and you have to glue them with the ( right stuff ) permatex # 85224 - i dont care what the tin gasket company sayes you need to glue them
the trick is to use a double sheet of paper towel and take the right stuff smear on to the gloves between the fingers a wad of glue - than work it into the tin gasket both sides all around - then take it the glued gasket and put it into the paper towel and fold over - change the gloves to new set they are gone - than pat the paper towel as it was folded over the glued gasket after a min or 2 - take a look - if its still thick and oozing - new paper towel and do over pat it for a min or 2 than look again if it looks like a cometic foam gasket its ready to install -
the only way we found to keep them from coming back a week later
coating the covers makes them worp BTW and we re dress the gasket area after its all coated, than we bolt the rockers in as well ( before machining ) then take it all apart to clean before its ready to install - bolting it as its going to be insatlled moves the covers a bit as well -- reason we do it that way
Last edited by johnjzjz; Dec 5, 2014 at 02:02 PM.
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